JP2013002658A - Opposed combustion boiler device - Google Patents

Opposed combustion boiler device Download PDF

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JP2013002658A
JP2013002658A JP2011131229A JP2011131229A JP2013002658A JP 2013002658 A JP2013002658 A JP 2013002658A JP 2011131229 A JP2011131229 A JP 2011131229A JP 2011131229 A JP2011131229 A JP 2011131229A JP 2013002658 A JP2013002658 A JP 2013002658A
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boiler
burner
coal
burners
mills
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Shunsuke Kikuchi
俊介 菊地
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Ihi Corp
株式会社Ihi
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PROBLEM TO BE SOLVED: To provide an opposed combustion boiler device capable of equalizing heat load between a can front wall side and a can rear wall side of a boiler even in changing a mill pattern.SOLUTION: This opposed combustion boiler device includes a coal burning boiler 10 having a can front wall 11 and a can rear wall 12 opposed to each other, a plurality of mills 2 for manufacturing pulverized coal, and a burner group 30 constituted of a plurality of burners 3 for supplying the pulverized coal from the mills 2 to the inside of the coal burning boiler 10. The burner group 30 is configured by arranging burner rows 31 formed by horizontally arranging six burners 3, vertically in four stages, and is disposed on the can front wall 11 and the can rear wall 12 while the burners 3 are opposed to each other, and the pulverized coal is supplied from one of the mills 2A-2D to all of the burners 3 of each burner row 31Af-31Df, 31Ar-31Dr on both can walls 11, 12 positioned at the same height of the burner group 30.

Description

本発明は、互いに対向する缶前壁及び缶後壁に、それぞれ複数のバーナを縦横に並べて配置して成る対向燃焼ボイラを備えた対向燃焼ボイラ装置に関するものである。   The present invention relates to an opposed combustion boiler apparatus including an opposed combustion boiler in which a plurality of burners are arranged in rows and columns on a can front wall and a can rear wall facing each other.
上記した対向燃焼ボイラ装置としては、例えば、互いに対向する缶前壁及び缶後壁を有するボイラと、燃料の石炭を粉砕して微粉炭を製造する複数のミルと、複数のミルからの微粉炭をボイラ側に送る給炭管と、給炭管により運ばれるミルからの微粉炭を一次空気とともにボイラ内部に供給する複数のバーナから成るバーナ群を備えた石炭焚きボイラ装置がある。   As the above-mentioned opposed combustion boiler device, for example, a boiler having a can front wall and a can rear wall facing each other, a plurality of mills for pulverizing fuel coal to produce pulverized coal, and a pulverized coal from a plurality of mills There is a coal-fired boiler apparatus including a coal supply pipe that feeds the boiler to the boiler side and a burner group that includes a plurality of burners that supply pulverized coal from a mill carried by the coal supply pipe together with primary air into the boiler.
バーナ群は、バーナを水平方向に複数並べて成るバーナ列を垂直方向に複数段並べて成っている。このバーナ群は、複数のバーナ列の各バーナ同士が互いに対向するようにしてボイラの缶前壁及び缶後壁にそれぞれ配置されており、バーナ群の1つ又は二つのバーナ列における複数のバーナに対して(一つ又は二つのバーナ列毎に)、1台のミルから給炭管を介して微粉炭が供給されるようになっている。   The burner group is formed by arranging a plurality of burner rows in which a plurality of burners are arranged in the horizontal direction in the vertical direction. The burner group is disposed on the front wall and the rear wall of the boiler so that the burners of the plurality of burner rows face each other, and the plurality of burners in one or two burner rows of the burner group are arranged. On the other hand (for every one or two burner rows), pulverized coal is supplied from one mill via a coal supply pipe.
このような石炭焚きボイラ装置において、ボイラの部分負荷に応じたミルの部分運転時や、ボイラ装置の起動及び停止におけるミルパターン(点火するバーナのパターン)の変更時には、ボイラの缶前壁の各バーナからボイラ内に供給される微粉炭量と缶後壁の各バーナからボイラ内に供給される微粉炭量との著しい差により、ボイラの缶前壁側と缶後壁側との間における熱負荷の分布にアンバランスが生じてしまう。   In such a coal-fired boiler device, when the mill is partially operated according to the partial load of the boiler, or when the mill pattern (pattern of the burner to be ignited) is changed at the start and stop of the boiler device, each of the boiler front walls Due to the significant difference between the amount of pulverized coal supplied from the burner into the boiler and the amount of pulverized coal supplied from each burner on the rear wall of the can into the boiler, the heat between the boiler front wall side and the can rear wall side An imbalance occurs in the load distribution.
このような問題に対処するべく成された対向燃焼ボイラ装置としては、例えば、特許文献1に開示されたものがある。
この対向燃焼ボイラ装置では、ボイラの缶前壁及び缶後壁にそれぞれ配置された同じ高さで対向するバーナ列の一部のバーナに対して1台のミルから微粉炭をそれぞれ供給すると共に、同じ高さで対向するバーナ列の残りのバーナに対して上記ミルとは異なるミルから微粉炭を供給することで、ボイラ内の熱負荷を均一化するようになっている。
For example, Patent Document 1 discloses an opposed combustion boiler device designed to cope with such a problem.
In this opposed combustion boiler apparatus, while supplying pulverized coal from one mill to each of the burners in the burner row facing each other at the same height arranged on the front wall and rear wall of the boiler, By supplying pulverized coal from a mill different from the above mill to the remaining burners in the burner row facing at the same height, the heat load in the boiler is made uniform.
特開2008-164188号公報JP 2008-164188
上記した特許文献1に開示された対向燃焼ボイラ装置では、1台のミルからボイラの缶前壁及び缶後壁における各同じ高さのバーナ列を構成する一部のバーナに対して微粉炭をそれぞれ供給するようにしているので、ボイラ内の熱負荷をある程度均一化することはできるものの、上記とは異なる他の1台のミルからもボイラの缶前壁及び缶後壁における各同じ高さのバーナ列を構成する残りのバーナに対して微粉炭をそれぞれ供給するようにしているので、両方のミルの微粉炭製造能力に差が有る場合には、ボイラの缶前壁及び缶後壁における各同じ高さのバーナ列の全バーナに対して、両方のミルから微粉炭を均等に供給することができない、すなわち、例えばボイラの部分負荷に応じたミルの部分運転時には、ボイラの缶前壁側と缶後壁側との間の熱負荷を均一化することができないという問題があり、この問題を解決することが従来の課題となっていた。   In the counter-combustion boiler apparatus disclosed in Patent Document 1 described above, pulverized coal is supplied from one mill to a part of burners constituting the burner rows of the same height on the front wall and rear wall of the boiler. Although the heat load in the boiler can be made uniform to some extent because each is supplied, the same height on the front wall and rear wall of the boiler can also be obtained from another one mill different from the above. As the pulverized coal is supplied to the remaining burners constituting the burner row, if there is a difference in the pulverized coal production capacity of both mills, the boiler front wall and can rear wall The pulverized coal cannot be evenly supplied from both mills to all the burners of the same height burner row, i.e. during the partial operation of the mill according to the partial load of the boiler, for example, the front wall of the boiler can Side and can rear wall There is a problem that the heat can not be made uniform load between, to solve this problem has been a conventional problem.
本発明は、上記した従来の課題に着目してなされたもので、ボイラの部分負荷に応じたミルの部分運転時や、ボイラ装置の起動及び停止におけるミルパターンの変更時であったとしても、ボイラの缶前壁側と缶後壁側との間の熱負荷を均一化することができ、その結果、ボイラ内における収熱のアンバランスを少なく抑えることが可能である対向燃焼ボイラ装置を提供することを目的としている。   The present invention was made by paying attention to the above-described conventional problems, even when the mill operation according to the partial load of the boiler or even when the mill pattern is changed at the start and stop of the boiler device, Provided an opposed combustion boiler device that can equalize the heat load between the boiler front wall side and the boiler rear wall side, and as a result, can reduce the unbalance of heat collection in the boiler. The purpose is to do.
本発明の請求項1に係る発明は、互いに対向する缶前壁及び缶後壁を有するボイラと、石炭を粉砕して微粉炭を製造する複数のミルと、これらの複数のミルからの微粉炭を前記ボイラ内部に供給する複数のバーナから成るバーナ群を備えた対向燃焼ボイラ装置であって、前記バーナ群は、前記バーナを水平方向に複数並べて成るバーナ列を垂直方向に複数段並べて形成されて、各段のバーナ列のバーナ同士が互いに対向するべく前記ボイラの前記缶前壁及び缶後壁にそれぞれ配置され、前記缶前壁に配置されるバーナ群及び前記缶後壁に配置されるバーナ群のうちの同じ高さに位置する各バーナ列毎に1台のミルが配置されて、この1台のミルの起動及び停止に伴って前記同じ高さに位置する各バーナ列のすべてのバーナによる微粉炭の供給及び停止が成される構成としたことを特徴としており、この対向燃焼ボイラ装置の構成を前述した従来の課題を解決するための手段としている。   The invention according to claim 1 of the present invention includes a boiler having a can front wall and a can rear wall facing each other, a plurality of mills for pulverizing coal to produce pulverized coal, and pulverized coal from these mills. An opposed combustion boiler apparatus comprising a burner group composed of a plurality of burners for supplying the inside of the boiler, wherein the burner group is formed by arranging a plurality of burner rows in the horizontal direction and arranging a plurality of burner rows in the vertical direction. The burners in each row of burners are arranged on the can front wall and the can rear wall of the boiler so as to face each other, and are arranged on the burner group arranged on the can front wall and the can rear wall. One mill is arranged for each burner row located at the same height in the group of burners, and all the burner rows located at the same height as the one mill is started and stopped. Supply of pulverized coal by burner And characterized in that a structure in which fine stop is made, and a means for solving the conventional problems described above the configuration of the counter the combustion boiler apparatus.
また、本発明の請求項2に係る対向燃焼ボイラ装置は、複数のミルの起動及び停止をコントロールする制御部を備え、この制御部により前記ボイラの負荷状況に応じた前記ミルの運転台数の変更が成される構成としている。   Moreover, the opposing combustion boiler apparatus which concerns on Claim 2 of this invention is equipped with the control part which controls starting and a stop of several mills, The change of the operation | movement number of the said mill according to the load condition of the said boiler by this control part Is configured.
本発明に係る対向燃焼ボイラ装置では、例えば、ボイラの部分負荷時におけるミルの部分運転時においても、運転中の1台のミルからボイラの缶前壁及び缶後壁における各同じ高さのバーナ列の全バーナに対して微粉炭を均等に供給し得ることから、ボイラの缶前壁側と缶後壁側との間における熱負荷の均一化が図られることとなる。   In the opposed combustion boiler apparatus according to the present invention, for example, even during partial operation of the mill at the time of partial load of the boiler, burners having the same height on the front wall and rear wall of the boiler from one mill in operation. Since the pulverized coal can be supplied uniformly to all the burners in the row, the thermal load between the can front wall side and the can rear wall side of the boiler can be made uniform.
この際、複数のミルの起動及び停止をコントロールする制御部により、ミルの運転台数を適宜変えることで、幅広い負荷運用に対応し得ることとなる。   At this time, a wide range of load operations can be handled by appropriately changing the number of mills operated by a control unit that controls the start and stop of a plurality of mills.
本発明に係る対向燃焼ボイラ装置では、上記した構成としているので、ボイラの部分負荷に応じたミルの部分運転時や、ボイラ装置の起動及び停止におけるミルパターンの変更時であったとしても、ボイラの缶前壁側と缶後壁側との間の熱負荷を均一化することが可能であり、その結果、ボイラ内における収熱のアンバランスを少なく抑えることができるという非常に優れた効果がもたらされる。   In the opposed combustion boiler device according to the present invention, the above-described configuration is adopted. Therefore, even when the mill pattern is changed according to the partial load of the boiler or when the mill pattern is changed at the start and stop of the boiler device. It is possible to equalize the heat load between the front wall side of the can and the rear wall side of the can, and as a result, it is possible to suppress the unbalance of heat collection in the boiler with a very excellent effect. Brought about.
本発明に係る対向燃焼ボイラ装置の一実施形態を示す石炭焚きタワーボイラ装置の概略側面説明図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic side view of a coal fired tower boiler apparatus showing an embodiment of an opposed combustion boiler apparatus according to the present invention. 図1における石炭焚きタワーボイラ装置のミルを省略して示す概略正面説明図である。It is a schematic front explanatory drawing which abbreviate | omits and shows the mill of the coal burning tower boiler apparatus in FIG. 図1における石炭焚きタワーボイラ装置の概略平面説明図である。It is a schematic plan explanatory drawing of the coal burning tower boiler apparatus in FIG.
以下、本発明に係る対向燃焼ボイラ装置を図面に基づいて説明する。
図1〜図3は、本発明に係る対向燃焼ボイラ装置の一実施形態を示しており、この実施形態では、対向燃焼ボイラ装置が石炭焚きタワーボイラ装置である場合を例に挙げて説明する。
Hereinafter, an opposed combustion boiler device according to the present invention will be described with reference to the drawings.
1 to 3 show an embodiment of an opposed combustion boiler device according to the present invention. In this embodiment, an example in which the opposed combustion boiler device is a coal-fired tower boiler device will be described.
図1に示すように、この石炭焚きタワーボイラ装置1は、互いに対向する缶前壁11及び缶後壁12を有していると共に上部に過熱器及び再熱器を配置した全体で箱型を成す石炭焚きボイラ10を備えている(過熱器及び再熱器は図示省略)。   As shown in FIG. 1, the coal fired tower boiler apparatus 1 has a can front wall 11 and a can rear wall 12 facing each other, and a superheater and a reheater are arranged on the upper portion to form a box shape. A coal-fired boiler 10 is provided (superheater and reheater are not shown).
また、この石炭焚きタワーボイラ装置1は、燃料の石炭を粉砕して微粉炭を製造する複数のミル2(2A〜2D)と、複数のミル2からの微粉炭を石炭焚きボイラ10側に送る給炭管4(4A〜4D)と、この給炭管4により運ばれるミル2からの微粉炭を一次空気とともに石炭焚きボイラ10内部に供給する複数のバーナ3から成るバーナ群30を備えている。   The coal-fired tower boiler apparatus 1 sends a plurality of mills 2 (2A to 2D) that pulverize fuel coal to produce pulverized coal and the pulverized coal from the plurality of mills 2 to the coal-fired boiler 10 side. A coal supply pipe 4 (4A to 4D) and a burner group 30 comprising a plurality of burners 3 for supplying pulverized coal from the mill 2 carried by the coal supply pipe 4 together with primary air into the coal-fired boiler 10 are provided. .
このバーナ群30は、バーナ3を水平方向に複数並べて成るバーナ列31を垂直方向に複数段並べて成っており、この実施例では、図2に示すように、バーナ3を水平方向に6個並べてバーナ列31を形成し、このバーナ列31を4段並べてバーナ群30を形成している。
このバーナ群30は、4段のバーナ列31の各バーナ3同士が互いに対向するようにして石炭焚きボイラ10の缶前壁11及び缶後壁12にそれぞれ配置されている。
This burner group 30 is composed of a plurality of burner rows 31 each having a plurality of burners 3 arranged in the horizontal direction, and in this embodiment, six burners 3 are arranged in the horizontal direction as shown in FIG. A burner row 31 is formed, and four burner rows 31 are arranged to form a burner group 30.
The burner group 30 is arranged on the can front wall 11 and the can rear wall 12 of the coal fired boiler 10 so that the burners 3 of the four-stage burner row 31 face each other.
この場合、図3にも示すように、バーナ群30のうちの同じ高さに位置する両缶壁11,12における各バーナ列31(31Af〜31Df,31Ar〜31Dr)の複数のバーナ3に対して(一つのバーナ列31毎に)、1台のミル2(2A〜2D)から給炭管4(4A〜4D)を介して微粉炭が供給されるようになっており、この石炭焚きタワーボイラ装置1において、制御部20によりミル2(2A〜2D)の運転台数を変えることで、幅広い負荷運用に対応し得るようになっている。   In this case, as shown also in FIG. 3, with respect to a plurality of burners 3 in each burner row 31 (31Af to 31Df, 31Ar to 31Dr) in both can walls 11 and 12 located at the same height in the burner group 30. The pulverized coal is supplied from one mill 2 (2A to 2D) through the coal supply pipe 4 (4A to 4D). In the boiler device 1, the control unit 20 can change the number of operating mills 2 (2 </ b> A to 2 </ b> D) to cope with a wide range of load operations.
缶前壁11及び缶後壁12の各バーナ群30の上方で且つ壁幅方向(水平方向)には、二次空気を通す二段燃焼用ポート13がそれぞれ複数並べて配置されており、これらの二段燃焼用ポート13の両端には、サイドポート14が配置されている。二次空気は、これらの二段燃焼用ポート13及びサイドポート14により分配されて石炭焚きボイラ10内に供給され、ポート13,14個々の空気通過量は、手動ダンパ5により運転前の段階でそれぞれ設定されるようになっている。   Above each burner group 30 of the can front wall 11 and the can rear wall 12 and in the wall width direction (horizontal direction), a plurality of two-stage combustion ports 13 through which secondary air passes are arranged side by side. Side ports 14 are arranged at both ends of the two-stage combustion port 13. The secondary air is distributed by these two-stage combustion ports 13 and side ports 14 and supplied into the coal-fired boiler 10, and the amount of air passing through each of the ports 13 and 14 is set by the manual damper 5 at a stage before operation. Each is set.
上記した石炭焚きタワーボイラ装置1では、石炭焚きボイラ10内の負荷状況に応じて、とくに、石炭焚きボイラ10の部分負荷時におけるミル2の部分運転時においても、運転中の1台のミル2、例えば、ミル2Aから石炭焚きボイラ10の缶前壁11及び缶後壁12における各同じ高さのバーナ列31Af,31Arの全バーナ31に対して微粉炭を均等に供給し得ることから、石炭焚きボイラ10の缶前壁11側と缶後壁12側との間における熱負荷のアンバランスが少なく抑えられることとなる。   In the above-described coal-fired tower boiler apparatus 1, one mill 2 in operation is operated according to the load state in the coal-fired boiler 10, especially during partial operation of the mill 2 when the coal-fired boiler 10 is partially loaded. For example, pulverized coal can be uniformly supplied from the mill 2A to all the burners 31 of the same height burner rows 31Af and 31Ar on the can front wall 11 and the can rear wall 12 of the coal-fired boiler 10. The imbalance of the thermal load between the can front wall 11 side and the can rear wall 12 side of the fired boiler 10 can be suppressed to a low level.
また、上記した石炭焚きタワーボイラ装置1では、複数のミル2の起動及び停止をコントロールする制御部20を備えているので、この制御部20によりミル2の運転台数を適宜変えることで、石炭焚きボイラ10の負荷状況に応じた幅広い運用に対応し得ることとなる。   In addition, since the above-described coal fired tower boiler apparatus 1 includes the control unit 20 that controls the starting and stopping of the plurality of mills 2, the coal fired by appropriately changing the number of mills 2 operated by the control unit 20. A wide range of operations according to the load status of the boiler 10 can be handled.
上記した実施形態では、本発明に係る対向燃焼ボイラ装置が石炭焚きタワーボイラ装置である場合を例に挙げて説明したが、これに限定されるものではない。   In the above-described embodiment, the case where the opposed combustion boiler apparatus according to the present invention is a coal-fired tower boiler apparatus has been described as an example, but the present invention is not limited thereto.
1 石炭焚きタワーボイラ装置(対向燃焼ボイラ装置)
2(2A,2B,2C,2D) ミル
3 バーナ
4(4A〜4D) 給炭管
10 石炭焚きボイラ(対向燃焼ボイラ)
11 缶前壁
12 缶後壁
20 制御部
30 バーナ群
31(31Af,31Bf,31Cf,31Df) 缶前壁側バーナ列
31(31Ar,31Br,31Cr,31Dr) 缶後壁側バーナ列
1 Coal fired tower boiler equipment (opposed combustion boiler equipment)
2 (2A, 2B, 2C, 2D) Mill 3 Burner 4 (4A-4D) Coal supply pipe 10 Coal-fired boiler (opposed combustion boiler)
11 Can front wall 12 Can rear wall 20 Control unit 30 Burner group 31 (31Af, 31Bf, 31Cf, 31Df) Can front wall side burner row 31 (31Ar, 31Br, 31Cr, 31Dr) Can rear wall side burner row

Claims (2)

  1. 互いに対向する缶前壁及び缶後壁を有するボイラと、
    石炭を粉砕して微粉炭を製造する複数のミルと、
    これらの複数のミルからの微粉炭を前記ボイラ内部に供給する複数のバーナから成るバーナ群を備えた対向燃焼ボイラ装置であって、
    前記バーナ群は、前記バーナを水平方向に複数並べて成るバーナ列を垂直方向に複数段並べて形成されて、各段のバーナ列のバーナ同士が互いに対向するべく前記ボイラの前記缶前壁及び缶後壁にそれぞれ配置され、
    前記缶前壁に配置されるバーナ群及び前記缶後壁に配置されるバーナ群のうちの同じ高さに位置する各バーナ列毎に1台のミルが配置されて、この1台のミルの起動及び停止に伴って前記同じ高さに位置する各バーナ列のすべてのバーナによる微粉炭の供給及び停止が成される
    ことを特徴とする対向燃焼ボイラ装置。
    A boiler having a can front wall and a can rear wall facing each other;
    A plurality of mills for pulverizing coal to produce pulverized coal;
    An opposed combustion boiler apparatus comprising a burner group consisting of a plurality of burners for supplying pulverized coal from the plurality of mills to the inside of the boiler,
    The burner group is formed by arranging a plurality of burner rows in which a plurality of the burners are arranged in a horizontal direction in a vertical direction, and the can front wall and the back of the can of the boiler so that the burners of each burner row face each other. Each placed on the wall,
    One mill is arranged for each burner row located at the same height among the burner group arranged on the front wall of the can and the burner group arranged on the rear wall of the can. The counter-combustion boiler apparatus, characterized in that supply and stop of pulverized coal are performed by all the burners of each burner row located at the same height as starting and stopping.
  2. 複数のミルの起動及び停止をコントロールする制御部を備え、この制御部により前記ボイラの負荷状況に応じた前記ミルの運転台数の変更が成される請求項1に記載の対向燃焼ボイラ装置。   The opposed combustion boiler device according to claim 1, further comprising a control unit that controls start and stop of the plurality of mills, wherein the control unit changes the number of mills to be operated in accordance with a load state of the boiler.
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Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN103335304A (en) * 2013-06-28 2013-10-02 广东电网公司电力科学研究院 Combustion system of corner tangential pulverized coal fired boiler
CN103712204A (en) * 2013-12-13 2014-04-09 山西蓝天环保设备有限公司 Wall type arrangement direct-current pulverized coal combustion technology used for industrial pulverized coal boiler
CN104990069A (en) * 2015-07-10 2015-10-21 西安热工研究院有限公司 Combustion system improving safety and economical performance of opposite-firing boiler

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JPH08285205A (en) * 1995-04-10 1996-11-01 Hitachi Eng Co Ltd Operation control method for coal thermal power plant
JPH0972534A (en) * 1995-09-06 1997-03-18 Ishikawajima Harima Heavy Ind Co Ltd Control device for damper concerning combustion in coal fired boiler
JP2000065305A (en) * 1998-08-20 2000-03-03 Babcock Hitachi Kk One-through type boiler
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JPS60165614U (en) * 1984-04-04 1985-11-02
JPH0410211U (en) * 1990-05-08 1992-01-29
JPH08285205A (en) * 1995-04-10 1996-11-01 Hitachi Eng Co Ltd Operation control method for coal thermal power plant
JPH0972534A (en) * 1995-09-06 1997-03-18 Ishikawajima Harima Heavy Ind Co Ltd Control device for damper concerning combustion in coal fired boiler
JP2000065305A (en) * 1998-08-20 2000-03-03 Babcock Hitachi Kk One-through type boiler
JP2008164188A (en) * 2006-12-27 2008-07-17 Babcock Hitachi Kk Pulverized coal combustion once-through boiler and power generation plant comprising the same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103335304A (en) * 2013-06-28 2013-10-02 广东电网公司电力科学研究院 Combustion system of corner tangential pulverized coal fired boiler
CN103712204A (en) * 2013-12-13 2014-04-09 山西蓝天环保设备有限公司 Wall type arrangement direct-current pulverized coal combustion technology used for industrial pulverized coal boiler
CN103712204B (en) * 2013-12-13 2016-05-11 山西蓝天环保设备有限公司 A kind of wall formula for industrial coal powder boiler is arranged direct-flow pulverized coal combustion device
CN104990069A (en) * 2015-07-10 2015-10-21 西安热工研究院有限公司 Combustion system improving safety and economical performance of opposite-firing boiler

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